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Verify battery voltage to the rear O2 sensor heater on the Black/Yellow wire with the key on. Check the Rear O2 sensor heater ground circuit voltage to the computer on the Black/White wire; clear the code first and see if the computer ever tries grounding the Black/White wire when starting the engine and if the code resets. Depending on what you find you will need to fix connector or repair/replace wiring. Let me know if you have questions. Thanks
P0141 Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Malfunction